A meter washer has a hole of diameter `d_(1)` and external diameter `d_(2)`, where `d_(2)=3d_(1)`. On heating , `d_(2)` increases by `0.3%`. Then `d_(1)` will :-

Options

A. (a)decreases by ` 0.1 %`
B. (b)decrease by `0.3%`
C. (c)increases by `0.1%`
D. (d)increase by `0.3%`.

Answer

D

Explanation

Expansion of a metal is same as photographic enlargement `implies d_(1)` will increase by `0.3%`
`implies d_(1) , 0.3%`